The students who listed the earliest events (marked with asterisks) all stated that they remembered them because they were there when the event happened (so it was a personal memory as well as being a media event). Mid-90s was what I expected. The more recent events… well, I’m pretty sure that they all can remember further back than 2 years ago. (Some of them even listed stuff that happened this year!) I figure those students just said the first thing that came to mind (rather than their first-ever memory). But… I suppose it is possible that 9/11 is the first big event that some of them remember.